Improvement in pumps



NQETERS. PHOTWLKTHDGRAPHER. WASHINGTON D C UNITED STATES PATENT OFFICE.

GEORGE H. DODGE, OF CAMDEN, NEW JERSEY.

IMPROVEMENT IN- PUMPS.

Specification forming part of Letters Patent No. 34,819, dated April l,1862.

T0 all whom, it may concern:

Be it known that I, GEORGE Il. DODGE, of Camden, Camden county, State ofNew Jersey, have invented certain new and useful Improvements inDouble-Acting Pumps; and I do hereby declare the following to be a full,clear, and exact description of the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.

My invention consists in the peculiarconstruction, arrangement, andoperation of parts which compose my improvements in doubleacting pumps,and which are fully described hereinafter, the ob jects of the saidimprovements being the attainment of simplicity andcheapness as regardsconstruction, a ready means of packing the plungers, and of drawing ottthe water from t-he pump after it has been used, and thus preventing theaccumulation of ice in the barrels during the winter months.

In order to enable others skilled in the art to make a-nd use myinvention, I will now proceed to describe its construction andoperation.

On reference to the accompanying drawings, which form a part of thisspecication, Figure l is a sectional view, and Fig. 2 a view of the rearend, of my improved double-acting pump. i

A and A are the two piston-rods of the u pump, the former passingthrough a stuffingboX a, attached to the upper barrel of the pump, andthe pistonrod A passing through the stuliingbox a, attached to the lowerbarrel of the pump. The front portions of these two barrels consist ofthe hollow cylinders B and B which are cast in one piece, the rearportion of the two barrels consisting of the two hollow cylinders C andC', which are also cast in one piece, and which communicate with eachother through a passage c, the hollow cylinder B being a continuation ofthe hollow cylinder C and the cylinder B a continuation of the cylinderC The two castings which thus form the front and rear ends of the twobarrels of the pump are secured to each other by bolts d d, which passthrough the flanges e and e of the two castings, between which are thepacking-pieces f f, of leather or any other appropriate material,

these packing-pieces forming the stuffingrd boxes for the upper plungerD and lower plunger D. Both of these plungers consist of hollowcylinders, and are so connected to the piston-rods that the water canhave an uninterrupted passage through the interior of the plungers. Therear end of the upper plunger D is furnished with an internal valve 71/and the rear end of the lower plunger D with an external valve e'.

Communicating with the front por-tion B of the lower barrel of the pumpis a branch k, to which is secured a pipe communicating with the well orreservoir from which the water has to be raised, a branch '011, whichforms a part of the said front portion of the lower barrel of the pump,being secured to the branch 7a, and the latter being attached to the topof the well or reservoir. Between the two branches 7c and m is thefootvalve n, which has a projection p, so formed and so situated as tobe acted on by a metal disk or washert on the end ot" ascrew E, whichpasses through a hollow screw u, and which is furnished at the outer endwith a suitable handle F, there being a washer s, of gum-elastic orother suitable material, between the metal washer t and the hollow screwu. It will be observed that a longitudinal groove is cut in the screw E,for an object which will be explained hereinafter'. An air-vessel G issecured to a branch w, which forms a part of and communicates with thehollow cylinder which forms the front portion of the upper barrel ot thepump, and from this air-vessel projects any desired outlet-pipe I-I. Thetwo piston-rods are connected together by the cross-head I, midway'between the opposite ends of which is a pin cc, passing through anoblong slot in the handle J, the fulcrum of the latter being on a pin y,secured in any suitable manner to the foundation on which the pumprests, so that on imparting a vibrating movement to the handle asimultaneous reciproca-ting motion will be imparted to the plungers,vboth moving in the same direction. Then the plungers are moved in thedirection of the arrow l, Fig. l, the footvalve n will be open, thevalve 7L being closed and the valve e' open, the water contained in thelower barrel will, owing to the vacuum caused by the upper plunger, passthrough the lower plunger D into the rear portion C of the lower barrel,as well as into the rear portion C of the upper barrel. At the same timethe plunger D, with its closed valve h, will be forcing the watercontained in the front portion B of the upper barrel into theair-chamber G and through the exit-pipe H. When the movement of theplungers is reversed, the foot-valve n, as well as the valve h, will beopen and the valve z'closed, so thatthe water contained in the lowerbarrel will be forced into the rear portion of both barrels through theplunger D and into the airvessel bythe lower plunger D', with its closedvalve, the foot-valve remaining open at all times, excepting when thereversal of the bar rels takes place, when the valve is momentarilyclosed. As the reciprocating motion of the plunger is continued,therefore, an uninterrupted stream of water must pass through theVexit-pi pe.

One of the most important features of my improved pump is its simplicityas regards construction, no boring out of the barrels be- .ingnecessary, as the plungers are free from contact with the interior ofthe barrel and bear against the packing-pieces ff only.

Another important feature in my improved pump is the ready manner oftightening the packing-pieces f f rou nd the plungers, this beingaccomplished by simply tightening the nuts of the bolts cl d, and thusbringing the rear portions nearer to the front portions of the barrels,and consequently compressing the packing-pieces of the two barrelssimultaneously. These packing-pieces also serve to keep the junctionbetween the two portions perfectly water tight.

When during the winter months the operation of the pump is discontinuedafter being temporarily used, it is important that as much of the wateras possible should be allowed to escape from the barrels,which wouldotherwise become inconveniently clogged with ice, This may beeffectually accomplished by the grooved screw E and footvalve n, for onvthe discontinuance of the movement of the plungers the screw E may beturned until its metal washer z5 is brought in contact with theprojection p of the footvalve n, thus raising the latter and forming afree passage for the escape of the water. At the same time the groove ofthe screw E affords a free passage for the air into the lower barrel ofthe pump and facilitates the free passage of Water into the reservoir orwell below. V-hen the pump has to be again used, the screw is turned toits former position, its metal washer t compressing the packing sagainst the end of the hollow screw u and preventing all entrance of airto the barrel along the groove of the screw.

I claim as` my invention and desire to secure by Letters Patentl. Theupper and lower barrels with the communicating passage c, the branches wand m and foot-valve n, in combination with the hollow plunger D and itsvalve h, and the hollow plunger D and its valve t', the whole beingconstructed, arranged, and operatingA as and for the purpose herein setforth.

2. The hollow plungers D and D with their respective valves, and thepacking-pieces ff, when the latter are conlined between the two portionsof the barrels, as setforth, for the purpose specied.

3. The grooved screw E, its metal disk or washer t, and packing-washerS, in combination with the foot-valve n and the projection p, the wholebeing arranged for joint action, substantially as and for the purposeherein specified. y

In testimony whereof l havesigned my name to this specification in thepresence of two subscribing witnesses.

GEORGE H. DODGE.,

Witnesses:

HENRY HowsoN, JOHN WHITE.

